Abstract: The invention relates to a method for producing a hollow shaft, in particular a camshaft according to an internal high-pressure forming (IHF) process. According to said method, cams and/or machine elements are mounted at intervals onto the outer surface of the hollow shaft, depending on the use of the latter, by a non-positive and/or positive fit, in a position appropriate to their function. The invention also relates to a hollow shaft produced according to said method. The invention aims to improve the efficiency of the method.

Abstract: A method for manufacturing a crankshaft for motor vehicles with passages being provided in the crankshaft for receiving lubricant. Prior to the casting process, place holders, which may include formed parts having cavities alone and/or together with a core, are inserted into the mold to form passages for receiving lubricant.

Abstract: A roll-hardening machine for crankshafts with hard-rolling tools (2) which each have a hard-rolling roller head (1) and a counter-support roller that are each detachably attached to the ends (17) of appropriate scissors arms (3) by means of two clamping blocks (15) wherein respectively a first of the two clamping blocks (15) is positioned on the front surface (16) of the end (17) of the scissor arm (3) and the second clamping block is located at a right angle to the first (15) on the side surface (16) of this same scissor arm (3) on the tool side, characterized in that the first clamping block (15) is supported on the front surface (16) at the end (17) of the respective scissors arm (3) such that it can slide in the direction of the appropriate hard-rolling tool (1), the hard-rolling roller head (1) is supported moveably at the location of the second clamping block on the scissors arm (3), by having guide grooves on its front surfaces facing the scissors arm (3), wherein prismatic blocks of the scissors arm (

Abstract: A method for machine a V crankshaft. A measurement is made of the dynamic mass and the centering points are drilled. The reference surfaces are preset by machining the raw crankshaft reference surfaces before the dynamic mass measurement.

Abstract: The fixed roll apparatus (8) of a fixed roll machine (1) for crankshafts (3) is constructed scissors-fashion. Two pivotable scissor arms (9 and 10) disposed opposite one another each bear a fixed roll head (13) and a support roll head (14) respectively. The support roll head (14) has two axis-parallel support rolls whose axes of rotation lie in a common plane. The support roll head (14) also has an axial guide roll which is disposed in front of the support rolls in the pivoting direction (35) for closure and whose axis of rotation is perpendicular to the axis of rotation of the crankshaft (3) and lies in a plane which forms an acute angle with the common plane of the axis of rotation of the support rolls, its diameter being larger than the width of the support roll head (14) and slightly smaller than the spacing of the adjacent oil collars of a main bearing pin or a connecting rod bearing pin.

Abstract: To improve a metal-cutting process for machining cylindrical contours, especially eccentric cylindrical contours on a workpiece mounted to rotate about a longitudinal axis, especially with eccentric crankshaft bearings using a lathe tool, producing a finished contour that either has end measures of satisfactory surface quality or has oversize for finish machining such as grinding or dressing, so that while maintaining or enhancing surface quality and maintaining or enhancing dimensional accuracy, machining times are reduced and overall economic efficiency is raised, the invention proposes that the tools tipped with cutting inserts, especially throw-away cutting inserts, are engaged successively or even simultaneously and that at least one part of the cutting inserts is guided in relation to the workpiece at an effective cutting angle (&ggr;f) between −5° and +5° and/or a positive tool back wedge angle (&ggr;p).

Abstract: The invention discloses a method and an apparatus for aligning crankshaft sections such as center sections of so-called “pressed-together crankshafts” found in multiple-cylinder-engines of the type used in personal motorized watercrafts and snowmobiles. The alignment of these crankshaft sections is effected by a phasing tool comprised of two symmetrical machined steel cylinders which are mounted on a die shoe, facing each other in virtual image formation, and provided with specifically designed phasing and centering tools. The phasing tools are designed in accordance with the diameters of the peripheral pins of the journals of the crankshaft section and the stroke of the crankshaft. A centering tool is used to center the crankshaft section with respect to the machined steel cylinders, and a spacing tool, placed between the two webs of the crankshaft section, prevents the force of the hydraulic-actuatordriven upper plate of the die shoe from compressing the crankshaft section excessively.

Abstract: A fillet rolling tool for deep rolling journal fillets is provided. The tool includes a housing assembly having a cavity. A backup roller having an annular groove is disposed in the cavity and is rotatably supported by the housing assembly. A work roller is received in the annular cavity for deep rolling journal fillets. At least one cage, construction from a polymer material, has an arcuate recess that receives the work roller. The cage includes an outer wall that defines a portion of the arcuate recess. Preferably the polymer is a thermal plastic such as a high density polyethylene. Most preferably, the polymer is an ultra high molecular weight polyethylene. The polymer of the present invention has a ductility, an impact strength, and a wear resistance that is superior to those of bronze. Accordingly, the polymer cage of the present invention does not fracture as easily as bronze under the lateral forces of the fillet rolling process.

Abstract: A method for making a multiple piece crankshaft from a shaft and a crankpin is disclosed. A notch is first machined on an intermediate section of the shaft such that the notch has a length slightly less than the length of the crankpin. Mating surfaces are then formed on the shaft at opposite ends of the notch. Thereafter, the crankpin is positioned on the mating surfaces on the shaft so that the crankpin is parallel to and spaced from an axis of the shaft. The ends of the crankpin are then secured to the mating surfaces formed on the crankshaft and a portion of the intermediate section of the shaft is then removed by machining. A counterweight is finally positioned over each end of the crankpin at its juncture with the main shaft and secured to the crankpin and shaft thereby forming the crankshaft. Alternatively, the crankpin is positioned on mating surfaces formed on the counterweights and fasteners then secure the crankpin, counterweights and main shaft together.

Abstract: The invention relates to a process and a device for machining of workpieces (10) like crankshafts or similar components which are rotated about their own axis during machining, at least two mutually independently operating rotary milling tools (15, 16, 21, 22) performing material-removing operations simultaneously at different points on a workpiece. In order to maximize the edge life of the tools used, with special regard to the most uniform wear possible on all the rotary milling tools, it is proposed that the rotation speed of the tools be matched or varied to provide an optimum cutting operation and the rotation speed of the second and any other rotary milling tool be controlled dependently upon the tool rotation speed predetermined by the matching or variation.

Abstract: The present invention provides a metal working device for cold working fillets which includes an upper block journally supporting a primary roller and a secondary roller. The primary roller has a rounded outer contact surface and the secondary roller has a concave mating surface. A portion of the concave mating surface is rollingly engaged with a portion of the outer contact surface along a predetermined contact area. The predetermined contact area is greater than 90 degrees. A support area is also provided which rollingly supports the object to allow the metal working device to cold work the fillets. Lastly, a pressure supplying device supplies pressure to the upper block to provide the required pressure to cold work the fillets.

Abstract: The present invention relates to an apparatus for machining workpieces (W1 to W4) by stock removal, in particular the main (a1 to a5) and/or connecting rod bearing journals (b1 to b4) of crankshafts. For this purpose the apparatus is equipped with at least two guideways (7, 8) which are distanced from one another and are arranged parallel with respect to one another and on which at least one workpiece fixture (9, 10) holding a workpiece (W1to W4) each can be moved from a transfer position (P1, P2) to a working position (A1 to A6), and with two discoid cutters (17, 18, 21) of which each can be moved on a cutter guideway (13, 14, 19), which is arranged between the guideways (7, 8), from a first working position (A1, A2, A5) in which it works on the workpiece (W1, W3) held by the first workpiece fixture (9) to a second working position (A3, A4) in which it works on the workpiece (W2, W4) held by the second workpiece fixture (10).

Abstract: The present invention relates to a forming press of crankshafts which is safe, has a slide of large strength and high forming precision, and is capable of high-speed cyclic operation. A forming press of crankshafts includes a forging unit for twisting and a forging unit for reshaping, wherein (i) a twisting oil-hydraulic cylinder is mounted on the crown, (ii) twisting push rods are disposed along outer surfaces of the slide, and (iii) the bottom ends of the twisting push rods are connected by twisting-down beams and untwisting beams. The slide is of inverted T-form in section, and the pressing block is of H-form as seen from above and of inverted U-form as seen from one side. Therefore, they do not interfere with each other and a large stroke can be secured. The twisting angle is set using an upper stopper provided in the pressing block and an automatic telescopic lower stopper provided in the slide and freely movable toward and away from the upper stopper.